According to an analysis by the 451 Group, the proportion of open source projects that uses the GPL family of licences has been declining for several years. According to the market researchers, in the summer of 2008, 70 per cent of projects were GPL- and LGPL-licensed; today it has fallen to 57 per cent. In a similar period (from summer 2009), the proportion of permissive licences (MIT, Apache, BSD license, and Microsoft Public License) has risen from under 15 per cent to over 25 per cent.

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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump